diff --git a/clients/bigquery/bigquery.go b/clients/bigquery/bigquery.go
index bce9ff214..207d74719 100644
--- a/clients/bigquery/bigquery.go
+++ b/clients/bigquery/bigquery.go
@@ -68,7 +68,11 @@ func (s *Store) PrepareTemporaryTable(tableData *optimization.TableData, tableCo
 	}
 
 	// Load the data
-	return s.putTableViaLegacyAPI(context.Background(), bqTempTableID, tableData)
+	if s.config.BigQuery.UseStorageWriteAPI {
+		return s.putTableViaStorageWriteAPI(context.Background(), bqTempTableID, tableData)
+	} else {
+		return s.putTableViaLegacyAPI(context.Background(), bqTempTableID, tableData)
+	}
 }
 
 func buildLegacyRows(tableData *optimization.TableData, additionalDateFmts []string) ([]*Row, error) {
@@ -158,6 +162,10 @@ func (s *Store) putTableViaLegacyAPI(ctx context.Context, tableID TableIdentifie
 	return nil
 }
 
+func (s *Store) putTableViaStorageWriteAPI(ctx context.Context, bqTableID TableIdentifier, tableData *optimization.TableData) error {
+	panic("not implemented")
+}
+
 func (s *Store) Dedupe(tableID sql.TableIdentifier, primaryKeys []string, topicConfig kafkalib.TopicConfig) error {
 	stagingTableID := shared.TempTableID(tableID, strings.ToLower(stringutil.Random(5)))
 
diff --git a/clients/bigquery/cast.go b/clients/bigquery/cast.go
index 7714f0876..cd0f535e2 100644
--- a/clients/bigquery/cast.go
+++ b/clients/bigquery/cast.go
@@ -65,28 +65,14 @@ func castColVal(colVal any, colKind columns.Column, additionalDateFmts []string)
 			return extTime.String(dialect.BQStreamingTimeFormat), nil
 		}
 	case typing.Struct.Kind:
-		// TODO: See if we can improve this eval and find a better location, see: https://github.com/artie-labs/transfer/pull/697#discussion_r1609280164
-		if strings.Contains(fmt.Sprint(colVal), constants.ToastUnavailableValuePlaceholder) {
-			return fmt.Sprintf(`{"key":"%s"}`, constants.ToastUnavailableValuePlaceholder), nil
-		}
-
-		// Structs from relational and Mongo are different.
-		// MongoDB will return the native objects back such as `map[string]any{"hello": "world"}`
-		// Relational will return a string representation of the struct such as `{"hello": "world"}`
-		if colValString, isOk := colVal.(string); isOk {
-			if colValString == "" {
-				return nil, nil
-			}
-
-			return colValString, nil
-		}
-
-		colValBytes, err := json.Marshal(colVal)
+		stringValue, err := EncodeStructToJSONString(colVal)
 		if err != nil {
-			return nil, fmt.Errorf("failed to marshal colVal: %w", err)
+			return nil, err
+		} else if stringValue == "" {
+			return nil, nil
+		} else {
+			return stringValue, nil
 		}
-
-		return string(colValBytes), nil
 	case typing.Array.Kind:
 		arrayString, err := array.InterfaceToArrayString(colVal, true)
 		if err != nil {
@@ -104,3 +90,23 @@ func castColVal(colVal any, colKind columns.Column, additionalDateFmts []string)
 	slog.Error("Unexpected BigQuery Data Type", slog.Any("colKind", colKind.KindDetails.Kind), slog.Any("colVal", colVal))
 	return fmt.Sprint(colVal), nil
 }
+
+// EncodeStructToJSONString takes a struct as either a string or Go object and encodes it into a JSON string.
+// Structs from relational and Mongo are different.
+// MongoDB will return the native objects back such as `map[string]any{"hello": "world"}`
+// Relational will return a string representation of the struct such as `{"hello": "world"}`
+func EncodeStructToJSONString(value any) (string, error) {
+	if colValString, isOk := value.(string); isOk {
+		if strings.Contains(colValString, constants.ToastUnavailableValuePlaceholder) {
+			return fmt.Sprintf(`{"key":"%s"}`, constants.ToastUnavailableValuePlaceholder), nil
+		}
+		return colValString, nil
+	}
+
+	colValBytes, err := json.Marshal(value)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal colVal: %w", err)
+	}
+
+	return string(colValBytes), nil
+}
diff --git a/go.mod b/go.mod
index 16b172e5a..54da614d0 100644
--- a/go.mod
+++ b/go.mod
@@ -140,6 +140,6 @@ require (
 	google.golang.org/genproto/googleapis/api v0.0.0-20240415180920-8c6c420018be // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240415180920-8c6c420018be // indirect
 	google.golang.org/grpc v1.63.2 // indirect
-	google.golang.org/protobuf v1.33.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 3eef7ef73..1de7b64d5 100644
--- a/go.sum
+++ b/go.sum
@@ -810,8 +810,8 @@ google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
-google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
+google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/lib/config/bigquery.go b/lib/config/bigquery.go
index 6e8250daa..c1d5c123f 100644
--- a/lib/config/bigquery.go
+++ b/lib/config/bigquery.go
@@ -5,11 +5,12 @@ import "fmt"
 type BigQuery struct {
 	// PathToCredentials is _optional_ if you have GOOGLE_APPLICATION_CREDENTIALS set as an env var
 	// Links to credentials: https://cloud.google.com/docs/authentication/application-default-credentials#GAC
-	PathToCredentials string `yaml:"pathToCredentials"`
-	DefaultDataset    string `yaml:"defaultDataset"`
-	ProjectID         string `yaml:"projectID"`
-	Location          string `yaml:"location"`
-	BatchSize         int    `yaml:"batchSize"`
+	PathToCredentials  string `yaml:"pathToCredentials"`
+	DefaultDataset     string `yaml:"defaultDataset"`
+	ProjectID          string `yaml:"projectID"`
+	Location           string `yaml:"location"`
+	BatchSize          int    `yaml:"batchSize"`
+	UseStorageWriteAPI bool   `yaml:"__useStorageWriteAPI"` // Not officially supported yet.
 }
 
 func (b *BigQuery) LoadDefaultValues() {